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1 | #!/usr/bin/python | |
2 | ############################################################################### | |
3 | # # | |
4 | # ddns - A dynamic DNS client for IPFire # | |
5 | # Copyright (C) 2012 IPFire development team # | |
6 | # # | |
7 | # This program is free software: you can redistribute it and/or modify # | |
8 | # it under the terms of the GNU General Public License as published by # | |
9 | # the Free Software Foundation, either version 3 of the License, or # | |
10 | # (at your option) any later version. # | |
11 | # # | |
12 | # This program is distributed in the hope that it will be useful, # | |
13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of # | |
14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # | |
15 | # GNU General Public License for more details. # | |
16 | # # | |
17 | # You should have received a copy of the GNU General Public License # | |
18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. # | |
19 | # # | |
20 | ############################################################################### | |
21 | ||
22 | import re | |
23 | import urllib | |
24 | import urllib2 | |
25 | ||
26 | from __version__ import CLIENT_VERSION | |
27 | from i18n import _ | |
28 | ||
29 | # Initialize the logger. | |
30 | import logging | |
31 | logger = logging.getLogger("ddns.system") | |
32 | logger.propagate = 1 | |
33 | ||
34 | class DDNSSystem(object): | |
35 | """ | |
36 | The DDNSSystem class adds a layer of abstraction | |
37 | between the ddns software and the system. | |
38 | """ | |
39 | ||
40 | # The default useragent. | |
41 | USER_AGENT = "IPFireDDNSUpdater/%s" % CLIENT_VERSION | |
42 | ||
43 | def __init__(self, core): | |
44 | # Connection to the core of the program. | |
45 | self.core = core | |
46 | ||
47 | @property | |
48 | def proxy(self): | |
49 | proxy = self.core.settings.get("proxy") | |
50 | ||
51 | # Strip http:// at the beginning. | |
52 | if proxy and proxy.startswith("http://"): | |
53 | proxy = proxy[7:] | |
54 | ||
55 | return proxy | |
56 | ||
57 | def guess_external_ipv6_address(self): | |
58 | """ | |
59 | Sends a request to an external web server | |
60 | to determine the current default IP address. | |
61 | """ | |
62 | response = self.send_request("http://checkip6.dns.lightningwirelabs.com") | |
63 | ||
64 | if not response.code == 200: | |
65 | return | |
66 | ||
67 | match = re.search(r"^Your IP address is: (.*)$", response.read()) | |
68 | if match is None: | |
69 | return | |
70 | ||
71 | return match.group(1) | |
72 | ||
73 | def guess_external_ipv4_address(self): | |
74 | """ | |
75 | Sends a request to the internet to determine | |
76 | the public IP address. | |
77 | ||
78 | XXX does not work for IPv6. | |
79 | """ | |
80 | response = self.send_request("http://checkip4.dns.lightningwirelabs.com") | |
81 | ||
82 | if response.code == 200: | |
83 | match = re.search(r"Your IP address is: (\d+.\d+.\d+.\d+)", response.read()) | |
84 | if match is None: | |
85 | return | |
86 | ||
87 | return match.group(1) | |
88 | ||
89 | def send_request(self, url, method="GET", data=None, timeout=30): | |
90 | assert method in ("GET", "POST") | |
91 | ||
92 | # Add all arguments in the data dict to the URL and escape them properly. | |
93 | if method == "GET" and data: | |
94 | query_args = self._format_query_args(data) | |
95 | data = None | |
96 | ||
97 | url = "%s?%s" % (url, query_args) | |
98 | ||
99 | logger.debug("Sending request (%s): %s" % (method, url)) | |
100 | if data: | |
101 | logger.debug(" data: %s" % data) | |
102 | ||
103 | req = urllib2.Request(url, data=data) | |
104 | ||
105 | # Set the user agent. | |
106 | req.add_header("User-Agent", self.USER_AGENT) | |
107 | ||
108 | # All requests should not be cached anywhere. | |
109 | req.add_header("Pragma", "no-cache") | |
110 | ||
111 | # Set the upstream proxy if needed. | |
112 | if self.proxy: | |
113 | logger.debug("Using proxy: %s" % self.proxy) | |
114 | ||
115 | # Configure the proxy for this request. | |
116 | req.set_proxy(self.proxy, "http") | |
117 | ||
118 | assert req.get_method() == method | |
119 | ||
120 | logger.debug(_("Request header:")) | |
121 | for k, v in req.headers.items(): | |
122 | logger.debug(" %s: %s" % (k, v)) | |
123 | ||
124 | try: | |
125 | resp = urllib2.urlopen(req) | |
126 | ||
127 | # Log response header. | |
128 | logger.debug(_("Response header:")) | |
129 | for k, v in resp.info().items(): | |
130 | logger.debug(" %s: %s" % (k, v)) | |
131 | ||
132 | # Return the entire response object. | |
133 | return resp | |
134 | ||
135 | except urllib2.URLError, e: | |
136 | raise | |
137 | ||
138 | def _format_query_args(self, data): | |
139 | args = [] | |
140 | ||
141 | for k, v in data.items(): | |
142 | arg = "%s=%s" % (k, urllib.quote(v)) | |
143 | args.append(arg) | |
144 | ||
145 | return "&".join(args) | |
146 | ||
147 | def get_address(self, proto): | |
148 | assert proto in ("ipv6", "ipv4") | |
149 | ||
150 | # Check if the external IP address should be guessed from | |
151 | # a remote server. | |
152 | guess_ip = self.core.settings.get("guess_external_ip", "true") | |
153 | ||
154 | # If the external IP address should be used, we just do | |
155 | # that. | |
156 | if guess_ip in ("true", "yes", "1"): | |
157 | if proto == "ipv6": | |
158 | return self.guess_external_ipv6_address() | |
159 | ||
160 | elif proto == "ipv4": | |
161 | return self.guess_external_ipv4_address() | |
162 | ||
163 | # XXX TODO | |
164 | assert False |